onVerticalDragUpdate method

void onVerticalDragUpdate(
  1. double delta,
  2. double availableHeight
)

Implementation

void onVerticalDragUpdate(double delta, double availableHeight) {
  if (availableHeight <= 0) return;
  final normalizedDelta = -delta / availableHeight;
  final newValue = (_animationController.value + normalizedDelta).clamp(
    0.0,
    1.0,
  );
  _animationController.value = newValue;
}